Aprilaire 400 User manual

Brand: Aprilaire

Model: 400

Category: Fireplaces

Type: User manual

READ AND SAVE THESE INSTRUCTIONS

Owner’s Manual

For Models 400, 550, 600 & 700

Includes Safety & Operating Instructions

and Warranty Information

Automatic Humidifiers

Genuine Aprilaire Replacement Water

Panel

evaporators are available from your

installing contractor or from most other

heating and air conditioning contractors in

your area. Use the dealer locator in our

web site (www.aprilaire.com) or look in

the Yellow Pages under Humidifying

Apparatus or Heating & Air Conditioning

Contractors. Purchase only genuine

Aprilaire Water Panels to maintain peak

performance.

Thank you for your recent Aprilaire

Humidifier purchase. We appreciate your

business. You have invested in the highest quality equipment available.

Aprilaire manufacturers whole-house indoor air quality products and is a

recognized leader in the heating and air conditioning industry.

Your unit will require periodic maintenance to assure continued fine

performance. See page 8 to obtain service parts and/or replacement Water

Panel

evaporators.

This booklet will familiarize you with the benefits you will receive from the

equipment you just purchased and help you understand the routine

maintenance required. Be sure to register your Humidifier warranty online at:

www.aprilaire.com/warranty.

TABLE OF CONTENTS

WARNING

120 volts may cause injury from electrical shock.

Disconnect power and shut off water supply before servicing.

CAUTION

Sudden operation may cause personal injury or property damage. Turn the

Aprilaire Humidifier Control to “OFF” or lowest setting before servicing.

Principle of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2

Operating Instructions – Model 400, 600 & 700

• Automatic Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3

• Manual Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5

Operating Instructions – Model 550 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7

Effect of Water Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7

Annual Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8

Annual Summer Shutdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8

Periodic Preventative Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9

MAINTENANCE INSTRUCTIONS

Model 400 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10

Model 600 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11

Model 700 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12

Model 550 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13

Limited Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14

TABLE OF CONTENTS

TABLE OF CONTENTSINTRODUCTION

- 1 -

With your purchase of a humidification system, you have invested in a

humidifier that operates on the evaporative principle – nature’s own way

of adding moisture – providing proper relative humidity throughout the

heating season. It is very possible that you have questions concerning

your new humidifier – questions on what it can do for you, and what you

should do to receive maximum benefits from it. This booklet is intended to

provide the answers you need.

Nature, in producing an invigorating comfortable April day, combines just

the right temperature and the right amount of moisture. Aprilaire

Humidifiers employ the same principle, with refinements, to give you the

optimum relative humidity for maximum allowable comfort all winter long.

The important considerations in the evaluation of a humidifier are precise

control, sufficient capacity, trouble-free performance and minimum

maintenance. The operating principle of your Aprilaire humidifier provides

all of these advantages. Here, briefly, is the method:

The Aprilaire Humidifier is installed to operate in conjunction with the

furnace blower. When the Aprilaire Humidifier Control calls for humidity

and the blower is operating, water flows to the distribution tray located at

the top of the unit. The water is uniformly distributed across the width of

the tray and through a scientifically designed system of outlets. It flows

by gravity over the Water Panel

evaporator, the heart of the unit. Dry, hot

air is moved through the moisture-laden Water Panel evaporator where

natural evaporation takes place. The now humidified air carrying moisture

in vapor form (nature’s own way) is circulated throughout the home.

The correct water flow is determined by an orifice equipped with

each drain type unit. When the unit is operating, there will be a small,

steady stream of water to drain, which flushes away most of the

trouble-causing minerals. Do not use the saddle valve to regulate the

water flow. It is designed to be completely opened or closed. The minerals

and solid residue not trapped by the replaceable Water Panel evaporator are

flushed down the drain in the Models 550, 600 and 700. This is the most

effective and least expensive method to dispose of trouble-causing minerals.

The drain also eliminates the problems caused by stagnant water.

There are some homes where drain facilities are not accessible or

available. For these situations, or where high water hardness is not a

problem, the newest Aprilaire, Model 400, is designed to satisfy these

applications.

TABLE OF CONTENTSI. PRINCIPLE OF OPERATION

- 2 -

Capacity is high because an average-size home (10,000 cu. ft.) requires

the addition of approximately 9 gallons of water per day to maintain 35%

relative humidity when the outside temperature is 20°. The smallest

Aprilaire Humidifier under most operating conditions, has this humidifying

capacity. Trouble-free performance and minimum maintenance are

assured by the design features of the Aprilaire Humidifier. All unit

housing parts that come in contact with water are non-metal and will

never rust or corrode. Neither heat nor water will affect them under

normal operating conditions.

The Water Panel

evaporator, designed especially for uniform, high

evaporation, and the Scale Control Insert efficiently traps mineral deposits

which are often the cause of damage to working parts in ordinary

humidifiers. No “white dust” can be distributed throughout the living

quarters. The Water Panel evaporator is the heart of the unit and must be

in good condition to assure high capacity trouble-free performance. It

should be changed once a year with the exception of the Model 400

which should be changed twice a heating season.

Older design water distribution trays have a granular coating in the

bottom of the distribution tray to provide even water flow to each of the

openings and over the Water Panel evaporator. Do not clean the

mineral scale off the bottom of the water distribution tray at the

end of the humidification season. If the granular coating is removed, it

is not necessary to purchase a new distribution tray, simply apply a small

amount of liquid dishwashing soap over the entire inside surface of the

water distribution tray. This will allow the water to flow evenly to the

water panel, provided the unit is level in order to achieve maximum

capacity.

The current distribution tray incorporates a synthetic fabric liner that

replaces the granular coating and is designed to deliver water uniformly

over the entire top surface of the Water Panel evaporator. It is normal for

some mineral deposits to form in the distribution tray as it dries out

between humidification cycles. These deposits can actually help distribute

water in the tray, but if they block the openings, they should be removed

as described in the “Periodic Preventative Maintenance” section of this

manual.

There are many humidifiers on the market. They all add moisture… with

varying degrees of efficiency. None, however, can provide the features,

design, and performance incorporated into your Aprilaire Humidifier.

- 3 -

There are 2 possible modes of operation of your Aprilaire Humidifier

Control – Automatic and Manual. An explanation of both modes follows:

Automatic Mode: (Manual Mode-see pg 5)

Your Aprilaire Humidifier Control is installed in the cold air return duct.

During the first heating season, your Humidifier Control needs to be set

initially to match your home’s condition. Please follow these steps when

adjusting your control (refer to Figure A).

1. Turn the dial setting knob to “5,” which is within the normal range.

During the next 24-48 hours it may be necessary to adjust the dial for

more or less humidity, depending on your personal comfort and home’s

requirements. Refer to the “Operation Guide” (Table 1).

2. During the coldest portion of the first heating season, minor adjustments

may be necessary. This is dependent upon your home’s construction.

Refer to the “Operation Guide” (Table 1).

TABLE 1 – Operation Guide

Condition Solution

Condensation on windows Reduce the setting on the control dial

by 1 increment.

Lack of humidity Increase the setting on the control dial

by 1 increment.

Humidifier does not operate Turn dial to “Test/Reset.” Make certain

furnace is operating in heat mode.

If unit still doesn’t operate, contact your

heating contractor.

Humidifier won’t shut off Turn dial to “Off.” If unit continues to

operate, contact your heating

contractor.

Test mode System operation is checked by setting

the knob to “Test/Reset.” Make certain

furnace blower is operating and furnace

is calling for heat. Humidifier will

operate for one minute. Be sure to turn

the control knob back to the prior setting

after checking humidifier operation.

Reset Water Panel change Turn the control knob to the

“Test/Reset” position until the “Change

Water Panel” light blinks to reset the

water panel change indicator timer.

(Blower must be operating and furnace

calling for heat.) Be sure to turn the

control knob back to the prior setting

after resetting the timer.

indicator

TABLE OF CONTENTSII. OPERATING INSTRUCTIONS – 400, 600 & 700

- 4 -

Your Aprilaire Automatic Humidifier, is a high precision system that will

accurately maintain the relative humidity in your home to a maximum of

45% RH and a minimum of 10% RH. For every 1° change in outdoor

temperature, the control will automatically adjust the indoor relative

humidity (RH) by

/2%. If you would like to determine the RH in your

home, follow these steps:

1. Determine the outdoor temperature.

2. Activate the furnace blower by setting your thermostat to a higher

temperature.

3. Turn the humidifier control dial setting to the “Off” position. Then, slowly

turn the dial clockwise until you hear the solenoid valve on the humidifier

“click on.” Next, slowly turn the dial counter clockwise until you hear the

solenoid valve “click off”. At this point, make note of the dial setting.

4. Locate your dial setting on Table 2. Follow the dial setting to the right

until it intersects with the current outdoor temperature. This is the

relative humidity in your home under existing conditions.

5. Return the thermostat and the Humidifier Control to their original

settings.

The values of outdoor temperature and dial settings may fall in between

or outside of the listed values in Table 2. In these cases, you can only

approximate your home’s actual indoor RH.

The relative humidity in your home

will now be accurately controlled to

meet your needs and should not

need further adjustment during

future heating seasons. Make note

of the dial setting in the event you

temporarily move the knob when

performing annual maintenance of

your Aprilaire Humidifier.

AUTOMATIC MODE

FIGURE A

- 5 -

Manual Mode: (Automatic Mode – see pg 3)

Your Aprilaire Humidifier Control is installed in the cold air return. It is

important to anticipate a drop in outdoor temperature and reduce the setting

accordingly to avoid excessive condensation. For example, with an outdoor

temperature of 20° the correct setting will be 35% relative humidity. If the

temperature is expected to fall to 0° that evening, then merely reduce the

setting to 25% several hours prior to the temperature change.

The recommended settings on the Humidifier Control are based on years

of research and experience (see Table 3). These settings represent a

compromise between RH levels that would be most desirable for comfort

reasons and humidity levels that are suitable for protection of your home

and to avoid condensation on your windows. For example, a wintertime

indoor RH of 50% may be considered ideal, but unfortunately, it probably

would result in damage to your home. Observance of the recommended

RH levels on your Humidifier Control, therefore, is an important safeguard.

Condensation of water on inside windows in the form of fogging or frost

is usually an indication of too much relative humidity. This same

condensation can take place in other areas in your home with the

possibility of damage resulting.

As an example, if the outdoor temperature is 20°F, and, following step 3,

the humidifier turns off at “5” on the dial range, then the RH in your home is 35%.

-10 0 10 20 30 40

1 10 10 10 15 20 25

2 10 10 15 20 25 30

3 10 15 20 25 30 35

4 15 20 25 30 35 40

5 20 25 30

35 40 45

6 25 30 35 40 45 45

7 30 35 40 45 45 45

Outdoor Temperature (°F)

Dial Setting

TABLE 2 – % Relative Humidity Guide

- 6 -

Your Aprilaire Humidifier Control

is a precision instrument that can

be used to determine the RH

accurately in your home during

the winter.

To do this, follow these steps:

1. Activate the furnace blower by

setting your thermostat to a

higher temperature.

2. Turn the control dial setting to

the “Off” position. Then, slowly

turn the dial clockwise until you

hear the solenoid valve on the humidifier “click on.” Next, slowly turn the

dial counter clockwise until you hear the solenoid valve “click off.” At this

point, read the RH on the dial. This will be very close to the actual RH

in your home. (See Figure B)

To check the humidifier operation, set the knob to “Test/Reset”, make

sure that the water saddle valve is open and that there is electricity to the

unit. The furnace blower motor must be operating and the furnace calling

for heat for the Aprilaire Humidifier to function. Note: Turning the knob to

“Test/Reset” resets the “Change Water Panel” internal timer. After the

humidifier has operated for one minute and water is entering the unit and

coming out at the drain, reduce the humidistat setting to the

recommended inside relative humidity, depending on the outside

temperature. DO NOT LEAVE IN TEST MODE AS HUMIDIFIER WILL NOT

OPERATE. Follow the suggested settings prior to a drop in the outside

temperature.

MANUAL MODE

FIGURE B

TABLE 3 – Outdoor-Indoor Relative Humidity

Outside Temperature Recommended RH

+40°F 45%

+30°F 40%

+20°F 35%

+10°F 30%

0°F 25%

–10°F 20%

–20°F 15%

- 7 -

Your new Aprilaire Humidifier is controlled by a manual humidistat

installed either in the living area or in the cold air return. It is important to

anticipate a drop in temperature and reduce the setting accordingly to

avoid excessive condensation. For example, with an outside temperature

of 20° the correct setting will be 35% relative humidity. If the

temperature is expected to fall to 0° that evening, then merely reduce the

setting to 25% several hours prior to the temperature change.

Be sure to keep fireplace dampers closed when not in use. They provide

an excellent escape route for heat, as well as humidity.

On occasion, indoor moisture producing activities such as clothes drying,

cooking, showers, etc., may raise the relative humidity level higher than it

should be, even though the Aprilaire Humidifier is not operating. Telltale

indications, again, are condensation or frost on cold surfaces such as

windows, doors, walls, etc. If such condensation persists for several

hours, your home should be ventilated to dissipate the potential damaging

excess moisture levels.

Your humidifier will operate effectively using either hot, cold, hard or

mechanically softened water. Whether to use available tap water, even

though it may be quite hard, or chemically softened water, is a common

question of homeowners when installing a humidifier.

Water used in homes contains varying amounts of minerals. The residue

remaining as a result of hard water evaporation is primarily calcium and

magnesium components and is usually quite hard, scaly, and dense.

Residue from softened water tends to be soft and fluffy and has a greater

volume than hard water scale. In either case, the service life of a Water Panel

evaporator will be virtually the same. The Water Panel evaporator should be

changed once a year with the exception of the Model 400 which should be

changed twice a heating season. In the drain-equipped models, most of

these solids are effectively controlled by flushing them down the drain.

TABLE OF CONTENTSIII. OPERATING INSTRUCTIONS – 550

TABLE OF CONTENTSV. EFFECT OF WATER CHARACTERISTICS

TABLE OF CONTENTSIV. ADDITIONAL INFORMATION FOR ALL MODELS

- 8 -

For best performance, we recommend that you replace the Water Panel

evaporator in your Aprilaire Humidifier annually with the exception of

Model 400 which should be changed twice a season. If you have a

Humidifier Control equipped with a “Change Water Panel” indicator light, it will

be lit (during operation only) when it is time to change your Water Panel. See

individual model instructions for additional maintenance.

To purchase a new Water Panel:

• Call the installer of your Aprilaire Humidifier. This information is often

found on your equipment.

• Call your heating and air conditioning dealer.

• Use our “Dealer Locator” at: www.aprilaire.com

• Look in the Yellow Pages under Humidifying Apparatus or

Heating & Air Conditioner Contractors.

• If none of the above is successful and you still need information, please

feel free to write us.

• Purchase only Genuine Aprilaire Water Panels to maintain performance.

If your humidifier is equipped with an automatic control, after replacing the Water

Panel, turn the control knob to the “Test/Reset” position until the “Change Water

Panel” light blinks to reset the Water Panel change indicator timer. (Blower must

be operating and furnace calling for heat.) Be sure to turn the control knob back to

it’s original setting.

1. For Models 400, 550, and 600 close the bypass damper, which is a part

of the unit, with the use of the small damper handle. For older Model

550s without a built in damper, closer the bypass which is installed in

the bypass pipe.

2. Shut off the water supply to the humidifier by closing the saddle valve.

Humidifier Control:

There is no adjustment to the Humidifier Control required for summer

shutdown. (Applies to both Automatic and Manual Mode.)

Service hot water, 140° maximum, is recommended with drain type units for

increasing capacity and for heat pump applications.

TABLE OF CONTENTSVI. ANNUAL MAINTENANCE

TABLE OF CONTENTSVII. ANNUAL SUMMER SHUTDOWN

- 9 -

1. Disconnect electrical power

to the furnace and shut off water

supply.

2. Disconnect the water line at the

inlet compression nut.

3. Remove the in-line strainer from

inside the inlet side of the valve

by using a small

nail or wire.

4. Flush the in-line strainer

clean or replace with a new

strainer, Service Department, Part

No. 4004.

5. Reconnect the inlet water line.

(Double Wrench To Prevent

Leaking.)

6. Disconnect the water feed tube

at the outlet compression nut.

7. Inspect the water feed tube by

gently flexing it and looking for

cracks or signs of wear. Replace

tube if it is cracked, brittle, or

has been damaged.

8. Remove the orifice from the copper or plastic water feed tube and make

sure this small opening is unplugged.

9. Replace the orifice and reconnect the water feed tube.

(Double Wrench To Prevent Leaking.)

10. Remove the drain hose from the bottom of the unit and flex it to loosen

any mineral deposits or blockage. Then flush it with water under

pressure and slip it back onto the drain fitting. Make sure the drain hose

has a constant downward slope and is not flattened or blocked.

11. Turn on water supply and reconnect electrical power to

the furnace.

OUTLET

COMPRESSION

NUT

ORIFICE

INLET

COMPRESSION

NUT

SOLENOID

VALVE

IN-LINE

STRAINER

INSPECTION AND SERVICE INSTRUCTIONS

NOTE: Periodic inspection and preventative maintenance of your total

heating system is important for efficient and safe operation. Your heating

contractor should include humidifier service at the same time.

All models are equipped with an in-line water strainer and orifice as

shown below. These parts should be inspected and cleaned periodically to

assure continued proper unit performance.

WATER FEED

TUBE

TABLE OF CONTENTSVIII. PERIODIC PREVENTATIVE MAINTENANCE

MODEL 400

- 10 -

1. Front Cover

2. Feed Tube

3. Integral Bypass Damper

4. Water Panel Evaporator

Assembly

5. Distribution Tray

6. “V” Notches

7. Water Panel

8. Scale Control Insert/Float

Chamber

9. Overflow Hose

10. Float Cover

11. Float

12. Water Level Sensor Assembly

1. Note Humidifier Control setting and turn dial to the “Off” position.

2. Turn off water supply. Turn the integral bypass damper (3) to the SUMMER position.

3. Press the tabs in the latches on the top and bottom of front cover (1) and pull cover off base with both

hands.

4. Carefully pull the plastic feed tube (2) out of the distribution tray (5) at the top of the Water Panel

evaporator assembly (4). Tip the Water Panel evaporator assembly forward and lift it out of the

humidifier. Do not tip the Water Panel evaporator assembly more than needed to clear the housing to

avoid over-bending the water level sensor assembly (12).

5. Unsnap the distribution tray (5) from the scale control insert (8). Follow the instructions below

depending upon the type of distribution tray in your humidifier:

For trays with a synthetic fabric liner:

Lightly scrape out or brush off any mineral deposits, being

careful not to stretch or loosen the synthetic fabric liner. Soaking the tray in vinegar or a lime-

removing agent is helpful when trying to remove stubborn mineral deposits.

For trays with granular coating:

Do not scrape off the granular coating, but lightly scrape out any

mineral deposits and clean the “V” notches (6). This textured surface helps ensure even water flow

for maximum performance. See page 3 if removed.

6. Slide the used water panel (7) out of the scale control insert/float chamber and dispose of the water

panel.

7. Remove the float cover (10) and inspect the floats (11) and float chamber for mineral build-up. Remove

deposits as needed from floats, float chamber and scale control insert. Wash the parts with a

disinfecting cleaner. Reassemble the floats and float cover. Make sure stems of both floats extend

through openings in float cover and that floats move freely up and down.

8. Inspect the plastic feed tube (2) by gently flexing it and looking for cracks or signs of wear. Replace

tube if it is cracked, brittle, or has been damaged.

9. Slide a new Aprilaire No. 45 water panel (7) into the scale control insert/float chamber (8). Snap the

distribution tray (5) back on the scale control insert (8).

10. Re-install the Water Panel evaporator assembly (4) into the humidifier. Take care not to over-bend the

water level sensor assembly. Push the top of the Water Panel evaporator assembly firmly back until it

snaps into place.

11. Push the end of the feed tube back firmly into the distribution tray. Replace the front cover.

12. Remove the overflow hose (9) from the bottom of the unit and flex it to loosen any mineral deposits or

blockage. Then flush with water under pressure and slip it back onto the drain fitting. Make sure the

drain hose has a constant downward slope and is not flattened or blocked.

13. Turn on the water supply. Return integral bypass damper to appropriate position.

14. Check system operation:

Humidifier Control

: (Automatic or Manual) Check system operation and reset change water panel

indicator by setting the knob to “Test/Reset”. With furnace blower operating and furnace calling for

heat, humidifier will operate for one minute. DO NOT LEAVE IN TEST MODE AS HUMIDIFIER WILL

NOT OPERATE.

15. Reset Humidifier Control to its original position.

MAINTENANCE INSTRUCTIONS FOR

APRILAIRE HUMIDIFIER MODEL 400

CAUTION! Sudden operation may cause personal injury or

property damage. Turn Humidifier Control to “off” or

lowest setting before servicing.

MODEL

400

- 11 -

1. Note Humidifier Control setting and turn dial to the “OFF” position.

2. Turn off water supply. Turn the integral bypass damper (3) to the SUMMER position.

3. Press the tabs in the latches on the top and bottom of front cover (1) and pull cover off base

with both hands. Set aside.

4. Carefully pull the plastic feed tube (2) out of the distribution tray (5) at the top of the Water

Panel evaporator assembly (4). Pull this assembly out by grasping at top and tipping out.

5. Unsnap the distribution tray (5) from the scale control insert (8). Follow the instructions below

depending upon the type of distribution tray in your humidifier:

For trays with a synthetic fabric liner:

Lightly scrape out or brush off any mineral deposits, being

careful not to stretch or loosen the synthetic fabric liner. Soaking the tray in vinegar or a lime-

removing agent is helpful when trying to remove stubborn mineral deposits.

For trays with granular coating:

Do not scrape off the granular coating, but lightly scrape out

any mineral deposits and clean the “V” notches (6). This textured surface helps ensure even

water flow for maximum performance. See page 3 if removed.

6. Slide the Water Panel evaporator (7) out from the Scale Control Insert (8). Clean the insert

frame of calcium deposits. Replace the Water Panel evaporator (Stock No. 35) and with a new

Genuine Aprilaire Water Panel. Slide the Water Panel back into the scale control insert with the

colored spot up and snap the distribution tray back into place.

7. Inspect the plastic feed tube (2) by gently flexing it and looking for cracks or signs of wear.

Replace tube if it is cracked, brittle, or has been damaged.

8. Re-install the Water Panel evaporator assembly (4) into the unit by fitting its drain into the round

receptacle at the base of the unit. Push the assembly in at the top against the beveled tabs that

will hold it in place. Push the end of the feed tube back firmly into the distribution tray and

replace the front cover.

9. Remove the drain hose (9) from the bottom of the unit and flex it to loosen any mineral deposits

or blockage. Then flush it with water under pressure and slip it back onto the drain fitting. Make

sure the drain hose has a constant downward slope and is not flattened or blocked.

10. Turn on the water supply. Return integral bypass damper to appropriate position.

11. Check system operation:

Humidifier Control

: (Automatic or Manual) Check system operation and reset change water

panel indicator by setting the knob to “Test/Reset”. With furnace blower operating and furnace

calling for heat, humidifier will operate for one minute. DO NOT LEAVE IN TEST MODE AS

HUMIDIFIER WILL NOT OPERATE.

12. Set Humidifier Control to its original position.

MAINTENANCE INSTRUCTIONS FOR

APRILAIRE HUMIDIFIER MODEL 600

CAUTION! Sudden operation may cause personal injury or

property damage. Turn Humidifier Control to “off” or

lowest setting before servicing.

1. Front Cover

2. Feed Tube

3. Integral Bypass

Damper

4. Water Panel

Evaporator

Assembly

5. Distribution Tray

6. “V” Notches

7. Water Panel

8. Scale Control

Insert

9. Drain Hose

MODEL 600

MODEL 700

- 12 -

1. Front Cover Assembly

2. Base

3. Water Panel

Evaporator Assembly

4. Distribution Tray

5. ”V” Notches

6. Water Panel

7. Scale Control Insert

8. Drain Hose

9. Power Cord

1. Note Humidifier Control setting and turn dial to the “OFF” position.

2. Disconnect electrical power and turn off water supply.

3. Unlatch humidifier front cover assembly (1) from base assembly (2) at the bottom of the cover, lift, and

set aside.

4. Pull out the water panel evaporator assembly (3) by grasping at the top and tipping out.

5. Unsnap the distribution tray (4) from the scale control insert (7). Follow the instructions below

depending upon the type of distribution tray in your humidifier:

For trays with a synthetic fabric liner:

Lightly scrape out or brush off any mineral deposits, being

careful not to stretch or loosen the synthetic fabric liner. Soaking the tray in vinegar or a lime-

removing agent is helpful when trying to remove stubborn mineral deposits.

For trays with granular coating:

Do not scrape off the granular coating, but lightly scrape out any

mineral deposits and clean the “V” notches (5). This textured surface helps ensure even water flow

for maximum performance. See page 3 if removed.

6. Slide the Water Panel evaporator (6) out from the Scale Control Insert (7). Clean the Scale Control

Insert by twisting and flexing it to loosen the calcium deposits. Replace the Water Panel evaporator

(Stock No. 35) and with a new Genuine Aprilaire Water Panel. Slide the Water Panel evaporator back

into the scale control insert with the colored spot up and snap the distribution tray (4) back into place.

7. Inspect the plastic feed tube by gently flexing it and looking for cracks or signs of wear. Replace tube

if it is cracked, brittle, or has been damaged.

8. Re-install the Water Panel evaporator assembly (3) into the base assembly (2). Push it in at the top

between the retaining ribs that hold the assembly in place in a vertical position.

9. Remove the drain hose (8) from the bottom of the unit and flex it to loosen any mineral deposits or

blockage. Then flush it with water under pressure and slip it back onto the drain fitting. Make sure the

drain hose has a constant downward slope and is not flattened or blocked.

10. Re-install front cover assembly (1) by hooking at the top of the base assembly (2) and latching at the

bottom.

11. Reconnect electrical power (9) and turn on the water supply.

12. Check system operation:

Humidifier Control

: (Automatic or Manual) Check system operation and reset change water panel

indicator by setting the knob to “Test/Reset”. With furnace blower operating and furnace calling for

heat, humidifier will operate for one minute. DO NOT LEAVE IN TEST MODE AS HUMIDIFIER WILL

NOT OPERATE.

13. Set Humidifier Control to its original position.

NOTE: The motor is permanently lubricated and does not need to be oiled.

MAINTENANCE INSTRUCTIONS FOR

APRILAIRE HUMIDIFIER MODEL 700

WARNING! 120 volts may cause serious injury from electrical shock.

Disconnect power and shut off water supply before servicing.

- 13 -

1. Note Humidistat setting and turn dial to the “OFF” position.

2. Turn offf water supply. Turn the integral bypass damper (10) to the SUMMER position.

3. At the side of the unit opposite the airflow duct pull front cover (1) off holding with both

hands and set aside.

4. Carefully pull the plastic feed tube (2) out of the nozzle (3) at the top of the Water Panel

evaporator assembly (4). Pull this assembly out by grasping at top and tipping out.

5. Unsnap the distribution tray from the scale control insert (8). Follow the instructions below

depending upon the type of distribution tray in your humidifier:

For trays with a synthetic fabric liner:

Lightly scrape out or brush off any mineral deposits,

being careful not to stretch or loosen the synthetic fabric liner. Soaking the tray in vinegar

or a lime-removing agent is helpful when trying to remove stubborn mineral deposits.

For trays with granular coating:

Do not scrape off the granular coating, but lightly scrape

out any mineral deposits and clean the “V” notches (6). This textured surface helps ensure

even water flow for maximum performance. See page 3 if removed.

6. Slide the Water Panel evaporator (7) out from the Scale Control Insert (8). Clean the insert

frame by twisting and flexing it to loosen the calcium deposits. Replace the Water Panel

evaporator (Stock No. 10) and with a new Genuine Aprilaire Water Panel. Slide the pad

back into the insert frame with color mark up and snap the distributon tray back into place.

7. Inspect the plastic feed tube (2) by gently flexing it and looking for cracks or signs of wear.

Replace tube if it is cracked, brittle, or has been damaged.

8. Re-install the Water Panel evaporator assembly (4) into the unit by fitting its drain into the

round receptacle at the base of the unit. Push the assembly in at the top against the

beveled tabs that will hold it in place. Push the end of the feed tube (2) back firmly into the

nozzle and replace the front cover.

9. Remove the drain hose (9) from the bottom of the unit and flex it to loosen any mineral

deposits or blockage. Then flush it with water under pressure and slip it back onto the

drain fitting. Make sure the drain hose has a constant downward slope and is not flattened

or blocked.

10. Turn on the water supply.

11. Check system operation:

Humidistat

: With the furnace blower operating and the furnace calling for heat, turn up

Humidistat and check system operation .

12. Set Humidistat to its original position.

MAINTENANCE INSTRUCTIONS FOR

APRILAIRE HUMIDIFIER MODEL 550

CAUTION! Sudden operation may cause personal injury or

property damage. Turn Humidistat to “off” or lowest setting

before servicing.

1. Front Cover

2. Feed Tube

3. Nozzle

4. Water Panel

Evaporator Assembly

5. Distribution Tray

6. ”V” Notches

7. Water Panel

8. Scale Control Insert

9. Drain Hose

10. Integral Bypass

Damper

MODEL 550

Your Research Products Corporation Aprilaire

Humidifier unit is expressly warranted for one (1)

year from date of installation to be free from defects except, however, for the disposable Water

Panel which will have to be replaced from time to time depending upon the amount of use.

Research Products Corporation’s exclusive obligation under this warranty shall be to supply,

without charge, a replacement for any part of the humidifier which is found to be defective within

one (1) year period and which is returned not later than thirty (30) days after said one (1) year

period by you to either your original supplier or to Research Products Corporation, Madison,

Wisconsin 53701, together with the model number, manufacturing code number and installation

date of the humidifier.

THIS WARRANTY SHALL NOT OBLIGATE RESEARCH PRODUCTS CORPORATION FOR ANY LABOR

COSTS AND SHALL NOT APPLY TO DEFECTS IN WORKMANSHIP OR MATERIALS FURNISHED BY

YOUR INSTALLER AS CONTRASTED TO DEFECTS IN THE HUMIDIFIER ITSELF.

IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE SHALL

BE LIMITED IN DURATION TO THE AFORESAID ONE YEAR PERIOD. RESEARCH PRODUCTS

CORPORATION’S LIABILITY FOR INCIDENTAL OR CONSEQUENTIAL DAMAGES, OTHER THAN

DAMAGES FOR PERSONAL INJURIES, RESULTING FROM ANY BREACH OF THE AFORESAID

IMPLIED WARRANTIES OR THE ABOVE LIMITED WARRANTY IS EXPRESSLY EXCLUDED. THIS

LIMITED WARRANTY IS VOID IF DEFECT(S) RESULT FROM FAILURE TO HAVE THIS UNIT

INSTALLED BY A QUALIFIED HEATING AND AIR CONDITIONING CONTRACTOR. IF THE LIMITED

WARRANTY IS VOID DUE TO FAILURE TO USE A QUALIFIED CONTRACTOR, ALL DISCLAIMERS OF

IMPLIED WARRANTIES SHALL BE EFFECTIVE UPON INSTALLATION.

Some states do not allow limitations on how long an implied warranty lasts or the exclusion or

limitation of incidental or consequential damages so the above exclusion or limitations may not

apply to you.

This warranty gives you specific legal rights and you may also have other rights which vary from

state to state.

Visit us on-line at www.aprilaire.com to register your Aprilaire product.

If you do not have on-line access, please mail a postcard with your name, address,

phone number, product purchased and date of purchase to:

Research Products Corporation, P.O. BOX 1828, Madison, WI 53701

Thank you!

Your Warranty Registration information will not be sold or shared outside of this company.

DP 10006405 01.05

B2203619C

PO BOX 1467 • MADISON, WI 53701-1467

- 14 -

Intelligent Solutions for Indoor Environments

An entire line of indoor air quality products that are the best in

their categories. Together they set a new standard for intuitive

use, performance and reliability. Aprilaire products enhance

your comfort, health and energy efficiency:

• Zoned Comfort Control • Automatic Humidifiers

• Electronic Thermostats • Ventilation • UV Germicidal Lamps

• High Efficiency Air Cleaners • Whole-Home Dehumidifiers

TABLE OF CONTENTSLIMITED WARRANTY

TABLE OF CONTENTSWARRANTY REGISTRATION

Aprilaire 400 User manual

Brand: Aprilaire

Model: 400

Category: Fireplaces

Type: User manual

Download PDF

report

Aprilaire 400 User manual

Aprilaire 400 User manual

Related papers

Other documents